body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
    sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

code {
  font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
    monospace;
}
.calendar {
  border: 1px solid #aaa;
  padding: 10px;
  width: 300px;
  height: 250px;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 40px;
}

.days {
  display: flex;
  flex-wrap: wrap;
}

.empty, .day {
  width: calc(100% / 7);
  text-align: center;
  line-height: 30px;
}

.day:hover,.selected {
  background-color: #ccc;
  cursor: pointer;
}

